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Solitary dispersive Alfven wave in a plasma with hot electrons, cold positrons and ions
Indian Journal of Physics ( IF 2 ) Pub Date : 2020-07-02 , DOI: 10.1007/s12648-020-01798-0
Y. Yu , Y. Liu

The dispersion relation and the nonlinear behaviour of dispersive Alfven waves (DAWs) in a plasma, which is composed by hot electrons, cold positrons and ions, are studied from the multi-component fluid theory. It can be indicated from the linear dispersion relation that the coupling of positron acoustic waves with shear Alfven waves results from the effect of the finite ion gyroradius. In our mode, the pressure and the inertia of the positron acoustic wave are, respectively, provided by the hot electrons and the cold positrons, which are different from the ones in a plasma consisting of two-group positrons with different temperatures. Furthermore, the existence and properties of DAW solitons are analysed from the Sagdeev pseudopotential equation, which indicates the existence of super-Alfvenic or sub-Alfvenic solitary DAWs, as well as the amplitude and width of DAW solitons depend on the positron concentration and the electron temperature. When the effects of cold positrons can’t be neglected, there may coexist the compressive and rarefactive DAW solitons. When the concentration of positron is negligibly small, the properties of DAW solitons in our model are similar to the ones of kinetic Alfven wave solitons in a plasma composed by hot electrons and cold ions.



中文翻译:

带有热电子,冷正电子和离子的等离子体中的孤散Alfven波

从多组分流体理论研究了由热电子,冷正电子和离子组成的等离子体中Alfven波(DAWs)的色散关系和非线性行为。从线性色散关系可以看出,正电子声波与剪切阿尔夫文波的耦合是由有限离子陀螺半径的作用引起的。在我们的模式中,正电子声波的压力和惯性分别由热电子和冷正电子提供,这与由温度不同的两组正电子组成的等离子体中的电子不同。此外,根据Sagdeev伪势方程分析了DAW孤子的存在和性质,表明存在超轻度或次轻度孤峰DAW,DAW孤子的幅度和宽度取决于正电子浓度和电子温度。当不能忽略冷正电子的影响时,可能会同时存在压缩性和稀疏性DAW孤子。当正电子的浓度微不足道时,我们模型中的DAW孤子的性质类似于由热电子和冷离子组成的等离子体中的动力学Alfven波孤子的性质。

更新日期:2020-07-03
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